<template>
  <div class="cart">
    <h4>全部商品</h4>
    <div class="cart-main">
      <div class="cart-th">
        <div class="cart-th1">全部</div>
        <div class="cart-th2">商品</div>
        <div class="cart-th3">单价（元）</div>
        <div class="cart-th4">数量</div>
        <div class="cart-th5">小计（元）</div>
        <div class="cart-th6">操作</div>
      </div>
      <div class="cart-body">
        <ul class="cart-list" v-for="(cart,index) in cartInfoList" :key="cart.id">
          <li class="cart-list-con1">
            <!-- $event可以获取当前元素的checked -->
            <input type="checkbox" name="chk_list" :checked="cart.isChecked==1" 
            @change="updateChecked(cart,$event)">
          </li>
          <li class="cart-list-con2">
            <img :src="cart.imgUrl">
            <div class="item-msg">{{cart.skuName}}</div>
          </li>
          <li class="cart-list-con4">
            <span class="price">{{cart.skuPrice}}.00</span>
          </li>
          <li class="cart-list-con5">
            <a href="javascript:void(0)" class="mins" @click="handler('minus',-1,cart)">-</a>
            <input autocomplete="off" type="text" :value="cart.skuNum" minnum="1" class="itxt" @change="handler('change',$event.target.value*1,cart)">
            <a href="javascript:void(0)" class="plus" @click="handler('add',1,cart)">+</a>
          </li>
          <li class="cart-list-con6">
            <span class="sum">{{cart.skuNum * cart.skuPrice}}</span>
          </li>
          <li class="cart-list-con7">
            <a class="sindelet" @click="deleteCartById(cart)">删除</a>
            <br>
            <a href="#none">移到收藏</a>
          </li>
        </ul>
      </div>
    </div>
    <div class="cart-tool">
      <div class="select-all">
        <input class="chooseAll" type="checkbox" :checked="isAllCheck&&cartInfoList.length>0" @change="updateAllCartChecked">
        <span>全选</span>
      </div>
      <div class="option">
        <a @click="deleteAllCheckedCart">删除选中的商品</a>
        <a href="#none">移到我的关注</a>
        <a href="#none">清除下柜商品</a>
      </div>
      <div class="money-box">
        <div class="chosed">已选择
          <span>0</span>件商品</div>
        <div class="sumprice">
          <em>总价（不含运费） ：</em>
          <i class="summoney">{{totalPrice}}</i>
        </div>
        <div class="sumbtn">
          <router-link class="sum-btn" to="/trade">结算</router-link>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import { mapGetters } from 'vuex';
//引入lodash,用于处理防抖节流业务
import throttle from "lodash/throttle";
  export default {
    name: 'ShopCart',
    mounted () {
      this.getData();
    },
    methods: {
      //获取个人购物车数据
      getData() {
        this.$store.dispatch('getCartList')
      },
      //修改某一个产品的个数[节流]
      handler:throttle(async function(type,disNum,cart){
        //type:为了区分这三个元素
        //目前disNum形参: + 变化的量(1) -变化的量(-1) input最终的个数(并不是变化的量)
        //cart:点击的哪一个产品[身上有id]
        // console.log('派发action,通知服务器修改个数',type,disNum,cart)
        //向服务器发请求,修改数量
        switch (type){
          //加号
          case "add":
            disNum = 1;
            break;
          case "minus":
            //判断产品的个数是否大于1,大于传-1给服务器,不大于传0给服务器(原封不动)
            disNum = cart.skuNum > 1 ? -1 : 0;
            break;
          case "change":
            //用户输入 进来的最终量,非法的(带有汉字||出现负数),带给服务器数字零
            if(isNaN(disNum) || disNum < 1){
              disNum = 0
            } else {
              //输入正常情况(如果用户输入小数,取整),带给服务器变化的量,用户输入进来的 - 产品的起始个数
              disNum = parseInt(disNum) - cart.skuNum //parseInt取整
            }
            //disNum = (isNaN(disNum)||disNum<1)?0:parseInt(disNum)-cart.skuNum
            break;
        }
        //派发action
        try {
            //代表的是修改成功
            await this.$store.dispatch('addOrUpdateShopCart',{skuId:cart.skuId,skuNum:disNum})
            //再一次获取服务器最新的数据进行展示
            this.getData()
        } catch (error) {
        }
      },500),
      //删除某一个产品的操作
      async deleteCartById(cart){
        try {
          //如果删除成功再次发请求获取新的数据进行展示
          await this.$store.dispatch('deleteCartListBySkuId',cart.skuId)
          this.getData()
        } catch (error) {
          alert(error.message)
        }
      },
      //修改某一个产品的勾选的状态
      async updateChecked(cart,event){
        //带给服务器的参数isChecked,不是布尔值,应该是0|1
        // console.log(event.target.checked)
        try {
          //如果修改数据成功,再次获取服务器数据(购物车)
          let isChecked = event.target.checked ? '1':'0'
          await this.$store.dispatch('updateCheckedById',{skuId:cart.skuId,isChecked})
          this.getData()
        } catch (error) {
          //如果失败
          alert(error.message)
        }
      },
      //删除全部选中的产品
      //这个回调函数我们没办法收集到一些有用的信息
      async deleteAllCheckedCart(){ 
        try {
          //派发一个action
          await this.$store.dispatch("deleteAllCheckedCart")
          //再次发请求获取购物车列表
          this.getData()
        } catch (error) {
          alert(error.message)
        }
      },
      //修改全部产品的选中状态
      async updateAllCartChecked(event){
        try {
          let isChecked = event.target.checked?'1':'0'
          // console.log(isChecked)
          //派发action
          await this.$store.dispatch("updateAllCartIsChecked",isChecked)
          this.getData()
        } catch (error) {
          alert(error.message)
        }
      }
    },
    computed:{
      ...mapGetters(['cartList']),
      //购物车数据
      cartInfoList(){
        return this.cartList.cartInfoList||[]
      },
     //计算购买产品的总价
      totalPrice(){
        let sum = 0
        this.cartInfoList.forEach(item => {
          // console.log(item)
          sum+= item.skuNum * item.skuPrice
        });
        return sum
      },
      //判断底部复选框是否勾选[全部产品都选中,才勾选]
      isAllCheck(){
        //遍历数组里面元素,只要全部元素isChecked属性都为1 返回真true
        //只要有一个不是1  返回假false
        return this.cartInfoList.every(item=>item.isChecked==1) && this.cartInfoList.length>0
      }
    },


  }
</script>

<style lang="less" scoped>
  .cart {
    width: 1200px;
    margin: 0 auto;

    h4 {
      margin: 9px 0;
      font-size: 14px;
      line-height: 21px;
    }

    .cart-main {
      .cart-th {
        background: #f5f5f5;
        border: 1px solid #ddd;
        padding: 10px;
        overflow: hidden;

        &>div {
          float: left;
        }

        .cart-th1 {
          width: 25%;

          input {
            vertical-align: middle;
          }

          span {
            vertical-align: middle;
          }
        }

        .cart-th2 {
          width: 25%;
        }

        .cart-th3,
        .cart-th4,
        .cart-th5,
        .cart-th6 {
          width: 12.5%;

        }
      }

      .cart-body {
        margin: 15px 0;
        border: 1px solid #ddd;

        .cart-list {
          padding: 10px;
          border-bottom: 1px solid #ddd;
          overflow: hidden;

          &>li {
            float: left;
          }

          .cart-list-con1 {
            width: 15%;
          }

          .cart-list-con2 {
            width: 35%;

            img {
              width: 82px;
              height: 82px;
              float: left;
            }

            .item-msg {
              float: left;
              width: 150px;
              margin: 0 10px;
              line-height: 18px;
            }
          }


          .cart-list-con4 {
            width: 10%;

          }

          .cart-list-con5 {
            width: 17%;

            .mins {
              border: 1px solid #ddd;
              border-right: 0;
              float: left;
              color: #666;
              width: 6px;
              text-align: center;
              padding: 8px;
            }

            input {
              border: 1px solid #ddd;
              width: 40px;
              height: 33px;
              float: left;
              text-align: center;
              font-size: 14px;
            }

            .plus {
              border: 1px solid #ddd;
              border-left: 0;
              float: left;
              color: #666;
              width: 6px;
              text-align: center;
              padding: 8px;
            }
          }

          .cart-list-con6 {
            width: 10%;

            .sum {
              font-size: 16px;
            }
          }

          .cart-list-con7 {
            width: 13%;

            a {
              color: #666;
            }
          }
        }
      }
    }

    .cart-tool {
      overflow: hidden;
      border: 1px solid #ddd;

      .select-all {
        padding: 10px;
        overflow: hidden;
        float: left;

        span {
          vertical-align: middle;
        }

        input {
          vertical-align: middle;
        }
      }

      .option {
        padding: 10px;
        overflow: hidden;
        float: left;

        a {
          float: left;
          padding: 0 10px;
          color: #666;
        }
      }

      .money-box {
        float: right;

        .chosed {
          line-height: 26px;
          float: left;
          padding: 0 10px;
        }

        .sumprice {
          width: 200px;
          line-height: 22px;
          float: left;
          padding: 0 10px;

          .summoney {
            color: #c81623;
            font-size: 16px;
          }
        }

        .sumbtn {
          float: right;

          a {
            display: block;
            position: relative;
            width: 96px;
            height: 52px;
            line-height: 52px;
            color: #fff;
            text-align: center;
            font-size: 18px;
            font-family: "Microsoft YaHei";
            background: #e1251b;
            overflow: hidden;
          }
        }
      }
    }
  }
</style>